Anellated (oxa)hydantoins and their use as herbicides

ABSTRACT

An anellated (oxa)hydantoin comprising the formula I ##STR1## wherein the (oxa)hydantoin of formula I possesses outstanding herbicidal properties.

This application is a Divisional application of U.S. Ser. No. 08/374,782, filed Apr. 21, 1995, now issued U.S. Pat. No. 5,661,109, and was the national stage application of PCT/EP93/02026, filed under 35 U.S.C. 371, Jul. 29, 1993.

The present invention relates to new anellated (oxa)hydantoins of the formula I ##STR2## wherein R¹ to R⁴ and Q have the meaning given in the description, a method for their preparation and their use as herbicides.

As has already been communicated, certain thiohydantoins (see EP-A2 0 290 902) or heterocyclic imides (see EP-A1 272 594, EP-B1 0 070 389) can be used as herbicides.

Surprisingly, new bicyclic imides have now been found which possess a distinctly better herbicidal action and excellent selectivity.

The present invention therefore comprises compounds of the formula I ##STR3## wherein R¹ and R², independently of one another, represent hydrogen or a group of the series (C₁ -C₄) alkyl, (C₁ -C₂) haloalkyl or phenyl, which is optionally fluorine-substituted,

R³ and R⁴, independently of one another, represent hydrogen, (C₁ -C₄) alkyl, phenyl, both optionally fluorine-substituted, and/or chlorine-, bromine- or methyl-substituted, (C₁ -C₄) alkoxy; or also together form a carbocyclic ring which may optionally be (C₁ -C₄) alkyl-substituted,

Q represents one of the radicals Q₁ -Q₇ ##STR4## wherein W represents O or S,

R⁵ represents hydrogen or halogen,

R⁶ represents (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl, OCH₃, SCH₃, OCHF₂, halogen, CN or NO₂,

R⁷ represents hydrogen, (C₁ -C₈) alkyl, (C₁ -C₈) haloalkyl, halogen, OR¹¹, S(O)_(n) R¹¹, COR¹¹, CO₂ R¹¹, C(O)SR¹¹, C(O)NR¹² R¹³, CHO, CH═CHCO₂ R¹¹, CO₂ N═CR¹⁴ R¹⁵, NO₂, CN, NHSO₂ R¹⁶ or NHSO₂ NHR¹⁶,

R⁸ represents hydrogen, (C₁ -C₃) alkyl, (C₁ -C₃). haloalkyl or halogen,

R⁹ represents hydrogen, (C₁ -C₃) alkyl, (C₁ -C₃) haloalkyl or halogen; or

if Q is Q-2 or Q-6, R⁸ and R⁹ together with the carbon atom to which they are bonded can be C═O;

R¹⁰ represents (C₁ -C₆) alkyl, (C₁ -C₆) haloalkyl, (C₂ -C₆) alkoxyalkyl, (C₃ -C₆) alkenyl or (C₃ -C₆) alkynyl,

R¹¹ represents (C₁ -C₈) alkyl, (C₃ -C₈) cycloalkyl, (C₃ -C₈) alkenyl, (C₃ -C₈) alkynyl, (C₁ -C₈) haloalkyl, (C₂ -C₈) alkoxyalkyl, (C₂ -C₈) alkylthioalkyl, (C₂ -C₈) alkylsulphinyl alkyl, (C₂ -C₈) alkylsulphonylalkyl, (C₃ -C₈) alkoxyalkoxyalkyl, (C₄ -C₈) cycloalkylalkyl, (C₂ -C₄) carboxyalkyl, (C₃ -C₈) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl, (C₆ -C₈) alkynyloxycarbonylalkyl, (C₄ -C₈) alkenoxyalkyl, (C₆ -C₈) cycloalkoxyalkyl, (C₄ -C₈) alkynyloxyalkyl, (C₃ -C₈) haloalkoxyalkyl, (C₄ -C₈) haloalkenyloxyalkyl, (C₄ -C₈) haloalkynyloxyalkyl, (C₆ -C₈) cycloalkylthioalkyl, (C₄ -C₈) alkenylthioalkyl, (C₄ -C₈) alkynylthioalkyl, (C₁ -C₄) alkyl-substituted with phenoxy or benzyloxy, which may both optionally be halogen-, (C₁ -C₃) alkyl- or (C₁ -C₃) haloalkyl-substituted; (C₄ -C₈) trialkylsilylalkyl, (C₃ -C₈) cyanoalkyl, (C₃ -C₈) halocycloalkyl, (C₃ -C₈) haloalkenyl, (C₅ -C₈) alkoxyalkenyl, (C₅ -C₈) haloalkoxyalkenyl, (C₅ -C₈) alkylthioalkenyl, (C₃ -C₈) haloalkyviyl, (C₅ -C₈) alkoxyalkynyl, (C₅ -C₈) haloalkoxyalkynyl, (C₅ -C₈) alkylthioalkynyl, (C₂ -C₈) alkylcarbonyl, benzyl optionally substituted with halogen, (C₁ -C₃) alkyl or (C₁ -C₃) haloalkyl; CHR¹⁷ COR¹⁸, CHR¹⁷ P(O) (OR¹⁸)₂, P(O) (OR¹⁸)₂, CHR¹⁷ P(S) (OR¹⁸)₂, CHR¹⁷ C(O)NR¹² R¹³, CHR¹⁷ C(O)NH₂, phenyl or pyridyl, both optionally substituted with halogen, (C₁ -C₃) alkyl, (C₁ -C₃) haloalkyl or

R¹² and R¹⁴, independently of one another, represent hydrogen or (C₁ -C₄) alkyl,

R¹³ and R¹⁵, independently of one another, represent (C₁ -C₄) alkyl, phenyl, optionally substituted with halogen, (C₁ -C₃) alkyl, (C₁ -C₃) haloalkyl or (C₁ -C₄) alkoxy, or

R¹² and R¹³ may be combined into rings as --(CH₂)₅ --, --(CH₂)₄ --, or --CH₂ CH₂ OCH₂ CH₂ --, wherein one or more H atoms in each ring may be substituted optionally by (C₁ -C₃ ) alkyl, phenyl or benzyl;

R¹⁴ and R¹⁵ together with the carbon atom to which they are bonded can form a (C₃ -C₈) cycloalkyl group,

R¹⁶ represents (C₁ -C₄) alkyl or (C₁ -C₄) haloalkyl,

R¹⁷ represents hydrogen or (C₁ -C₃) alkyl,

R¹⁸ represents (C₁ -C₆) alkyl, (C₃ -C₆) alkenyl or (C₃ -C₆) alkynyl, and

n represents 0, 1, 2.

In the definitions given above, the term "alkyl", alone or in the compound term as "alkylthio" or "haloalkyl", includes a linear or branched chain, for example, methyl, ethyl, n-propyl, isopropyl or the various butyl isomers. Alkoxy includes methoxy, ethoxy, n-propyloxy, isopropyloxy- and the different butyl isomers. Alkenyl includes linear or branched alkenes, for example, 1-propenyl, -propenyl, 3-propenyl and the different butyl isomers. Cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. The term "halogen", alone or in the compound term as "haloalkyl" signifies fluorine, chlorine, bromine or iodine In addition, when "haloalkyl" is used in the compound term, then "alkyl" may be partially or wholly substituted by halogen atoms, which in their turn may be identical or different. Examples of haloalkyl include CH₂ CH₂ F, CF₂ CF₃ and CH₂ CHFCl.

The following radicals are preferred, wherein

R¹ and R², independently of one another, represent hydrogen or a group of the series (C₁ -C₄) alkyl, (C₁ -C₂) haloalkyl or phenyl, which is optionally fluorine-substituted,

R³ and R⁴, independently of one another, represent hydrogen, (C₁ -C₃) alkyl, phenyl, optionally fluorine-substituted and/or chlorine-, bromine-, methyl-substituted, (C₁ -C₂) alkoxy; or together form a carbocyclic ring which may optionally be (C₁ -C₂) alkyl-substituted,

Q signifies ##STR5## wherein W represents O or S,

n represents 0, 1, 2,

R⁵ represents hydrogen or halogen,

R⁶ represents halogen or CN,

R⁷ represents hydrogen, (C₁ -C₄) alkyl, (C₁ -C₄) haloalkyl, halogen, OR¹¹, S(O)_(n) R¹¹, COR¹¹, CO₂ R¹¹, C(O)SR¹¹, C(O)NR¹² R¹³, CH═CHCO₂ R¹¹, CO₂ N═CR¹⁴ R¹⁵, NHSO₂ R¹⁶, or NHSO₂ NHR¹⁶,

R⁸ represents hydrogen, (C₁ -C₃) alkyl or (C₁ -C₃) haloalkyl,

R⁹ represents hydrogen, (C₁ -C₃) alkyl or (C₁ -C₃) haloalkyl; or if Q is Q-2 or Q-6, R⁸ and R⁹ together with the carbon atom to which they are bonded can be C═O;

R¹⁰ represents (C₁ -C₄) alkyl, (C₁ -C₄) haloalkyl, (C₂ -C₄) alkoxyalkyl, (C₃ -C₆) alkenyl or (C₃ -C₆) alkynyl,

R¹¹ represents (C₁ -C₄) alkyl, (C₃ -C₆) cycloalkyl, (C₃ -C₆) alkenyl, (C₃ -C₆) alkynyl, (C₁ -C₄) haloalkyl, (C₂ -C₄) alkoxyalkyl, (C₂ -C₄) alkylthioalkyl, (C₂ -C₄) alkylsulphinylalkyl, (C₂ -C₄) alkylsulphonylalkyl, (C₃ -C₆) alkoxyalkoxyalkyl, (C₄ -C₈) cycloalkylalkyl, (C₂ -C₄) carboxyalkyl, (C₃ -C₆) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl, (C₆ -C₈) alkynyloxycarbonylalkyl, (C₄ -C₆) alkenoxyalkyl, (C₆ -C₈) cycloalkoxyalkyl, (C₄ -C₆) alkynyloxyalkyl, (C₃ -C₆) haloalkoxyalkyl, (C₄ -C₈) haloalkenyloxyalkyl, (C₄ -C₆) haloalkynyloxyalkyl, (C₆ -C₈) cycloalkylthioalkyl, (C₄ -C₆) alkenylthioalkyl, (C₄ -C₆) alkynylthioalkyl, (C₁ -C₂) alkyl-substituted with phenoxy or benzyloxy, which may both optionally be halogen-, (C₁ -C₃) alkyl- or (C₁ -C₃) haloalkyl-substituted; (C₄ -C₈) trialkylsilylalkyl, (C₃ -C₄) cyanoalkyl, (C₃ -C₆) halocycloalkyl, (C₃ -C₆) haloalkenyl, (C₅ -C₆) haloalkoxyalkenyl, (C₅ -C₆) alkylthioalkenyl, (C₃ -C₆) haloalkynyl, (C₅ -C₆) alkoxyalkynyl, (C₅ -C₆) haloalkoxyalkynyl, (C₅ -C₆) alkylthioalkynyl, (C₂ -C₄) alkylcarbonyl, benzyl optionally substituted with halogen, (C₁ -C₂) alkyl or (C₁ -C₂) halalkyl; CHR¹⁷ COR¹⁸, CHR¹⁷ P(O) (OR¹⁸)₂, P(O) (OR¹⁸)₂, CHR¹⁷ P(S) (OR¹⁸)₂, CHR¹⁷ C(O)NR¹² R¹³, CHR¹⁷ C (O)NH₂, phenyl or pyridyl, both optionally substituted with halogen, (C₁ -C₃) alkly, (C₁ -C₃) haloalkyl or (C₁ -C₄ ) alkoxy,

R¹² and R¹⁴, independently of one another, represent hydrogen or (C₁ -C₂) alkyl,

R¹³ and R¹⁵, independently of one another, represent (C₁ -C₂) alkyl, phenyl, optionally substituted with halogen, (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl or (C₁ -C₂) alkoxy, or

R¹² and R¹³ may be combined into rings as --(CH₂)₅ --, --(CH₂)₄ --, or --CH₂ CH₂ OCH₂ CH₂ --, wherein one or more H atoms in each ring may be substituted optionally by (C₁ -C₂) alkyl, phenyl or benzyl;

R¹⁴ and R.sup.. together with the carbon atom to which they are bonded can form a (C₃ -C₆) cycloalkyl group,

R¹⁶ represents (C₁ -C₄) alkyl or (C₁ -C₄) haloalkyl,

R¹⁷ represents hydrogen or (C₁ -C₃) alkyl,

R¹⁸ represents (C₁ -C₄) alkyl, (C₃ -C₄) alkenyl or (C₃ -C₄) alkynyl

The following radicals are preferred, wherein

R¹ and R², independently of one another, represent hydrogen or a group of the series (C₁ -C₃) alkyl, (C₁ -C₂) haloalkyl or phenyl, which is optionally fluorine-substituted,

R³ and R⁴, independently of one another, represent hydrogen, (C₁ -C₃) alkyl, or also together form a 5- to 6-membered carbocyclic ring, which may optionally substituted with (C₁ -C₄) alkyl radicals,

Q signifies ##STR6## wherein W represents O or S,

n represents 0, 1, or 2,

R⁵ represents hydrogen, fluorine or chlorine,

R⁶ represents chlorine, bromine or cyanogen,

R⁷ represents hydrogen, OR¹¹ or CO₂ R¹¹,

R⁸ and R⁹, independently of one another, represent hydrogen, (C₁ -C₂) alkyl or (C₁ -C₂) haloalkyl,

R¹⁰ represents (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl, (C₃ -C₄) alkenyl or (C₃ -C₄) alkynyl,

R¹¹ represents (C₁ -C₄) alkyl, (C₃ -C₆) cycloalkyl, (C₃ -C₆) alkenyl, (C₃ -C₆) alkynyl, (C₁ -C₄) haloalkyl, (C₂ -C₄) alkoxyalkyl, (C₂ -C₄) alkylthioalkyl, (C₂ -C₄) alkylsulphinylalkyl, (C₂ -C₄) alkylsulphonylalkyl, (C₃ -C₆) alkoxyalkoxyalkyl, (C₄ -C₈) cycloalkylalkyl, (C₂ -C₄) carboxyalkyl, (C₃ -C₆) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl, (C₆ -C₈) alkynyloxycarbonylalkyl, (C₆ -C₈) cycloalkoxyalkyl, (C₄ -C₆) alkenyloxyalkyl, (C₄ -C₆) alkynyloxyalkyl, (C₃ -C₆) haloalkoxyalkyl, (C₄ -C₈) haloalkenyloxyalkyl, (C₄ -C₆) haloalkynyloxyalkyl, (C₆ -C₈) cycloalkylthioalkyl, (C₄ -C₆) alkenylthioalkyl, (C₄ -C₆) alkynylthioalkyl, (C₁ -C₂) alkyl-substituted with phenoxy or benzyloxy, which are both optionally substituted with halogen-, (C₁ -C₃) alkyl- or (C₁ -C₃) haloalkyl; (C₄ -C₈) trialkylsilylalkyl, (C₃ -C₄) cyanoalkyl, (C₃ -C₆) halocycloalkyl, (C₃ -C₆) haloalkenyl, (C₅ -C₆) alkoxyalkenyl, (C₅ -C₆) haloalkoxyalkenyl, C₅ -C₆) alkylthioalkenyl, (C₃ -C₆) haloalkynyl, (C₅ -C₆) alkoxyalkynyl, (C₅ -C₆) haloalkoxyalkynyl, (C₅ -C₆) alkylthioalkynyl, (C₂ -C₄) alkylcarbonyl, benzyl optionally substituted with halogen, (C₁ -C₂) alkyl or (C₁ -C₂) haloalkyl; CHR¹⁷ COR¹⁸, CHR¹⁷ P(O) (OR¹⁸)₂, P(O) OR¹⁸)₂, CHR¹⁷ P (S) (OR¹⁸)₂, CHR¹⁷ C (O) NR¹² R¹³, CHR¹⁷ C (O) NH₂, phenyl or pyridyl, both optionally substituted with fluorine, chlorine or bromine, (C₁ -C₂) haloalkyl or (C₁ -C₂) alkoxy,

R¹² represents hydrogen or (C₁ -C₂) alkyl,

R¹³ represents (C₁ -C₂) alkyl, phenyl optionally substituted with fluorine, chlorine, bromine, (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl or (C₁ -C₂) alkoxy, or

R¹² and R¹³ may be combined into rings as --(CH₂)₅ --, --(CH₂)₄ --, or --CH₂ CH₂ OCH₂ CH₂ --, wherein one or more H atoms in each ring may be substituted optionally by (C₁ -C₂) alkyl,

R¹⁷ represents hydrogen or (C₁ -C₂) alkyl,

R¹⁸ represents (C₁ -C₂) alkyl, (C₃ -C₄) alkenyl or (C₃ -C₄) alkynyl.

The following radicals are preferred, wherein

R¹ and R², independently of one another, represent hydrogen, (C₁ -C₃) alkyl, (C₁ -C₂) haloalkyl or phenyl,

R³ and R⁴ independently of one another, represent hydrogen or (C₁ -C₃) alkyl, or together form a 5- to 6-membered carbocyclic ring.

Q signifies ##STR7## wherein R⁵ represents fluorine or chlorine,

R⁶ represents chlorine,

R⁷ represents OR¹¹ or CO₂ R¹¹

R¹¹ represents (C₁ -C₄) alkyl, (C₃ -C₆) cycloalkyl, (C₃ -C₆) alkenyl, (C₃ -C₄) alkynyl, (C₁ -C₃) haloalkyl, (C₂ -C₄)alkoxyalkyl (C₃ -C₆) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl or (C₆ -C₈) alkynyloxycarbonyl.

The present invention relates both to the possible individual stereoisomers of the formula I and to mixtures of the isomers The stereoisomers having the 2R,3S configuration are preferred to others.

The new anellated (oxa)hydantoins of the general formula I are obtained according to the present invention by a general method A, when aryl isocyanates of the general formula II

    Q--N═C═O                                           II

wherein

Q has the meaning given above, and

oxazolidine carboxylic acid (ester) of the general formula III ##STR8## wherein R¹, R², R³ and R⁴ (R³ =R⁴ |=H) have the meaning given above and R is H, (C₁ -C₄) alkyl or an active ester, are reacted together according to method A optionally in the presence of an acid acceptor and optionally in the presence of a diluent.

The invention also provides a method B for preparing compounds of the formula I, which is illustrated below, and wherein R¹ to R⁴ and Q have the above meanings, wherein a compound of the formula III, wherein R stands for H and ##STR9## which can be prepared under equilibrium conditions from compounds of the formula IV and compounds of the formula V or salts thereof optionally in the presence of an acid acceptor and optionally in the presence of a diluent, is reacted with a compound of the formula II optionally in the presence of an acid acceptor and optionally in the presence of a diluent, in order to obtain compounds of the formula VI, wherein R is H, (C₁ -C₄) alkyl or an active ester ##STR10## which can then be converted by ring closure into compounds of the formula I.

The invention also provides a method C for preparing compounds of the formula I, which is illustrated below, and wherein R¹ to R⁴ have the above meanings To this end a compound of the formula III, wherein R stands for H or (C₁ -C₄) alkyl, is reacted with phosgene or a phosgene substitute, with first of all compounds of the formula VII being formed, which latter compounds are then reacted with compounds of the formula VIII, wherein Q has the meaning given above, in order to obtain compounds of the formula VI, ##STR11## which can then be converted by ring closure into compounds of the formula I.

The invention also provides a method D for preparing compounds of the formula I, which is illustrated below, and wherein R¹ to R⁴ and Q have the above meanings, wherein a compound of the formula II is reacted with a compound of the formula IX, optionally in the presence of an acid acceptor and optionally in the presence of a diluent, in order to obtain compounds of the formula X, and the compounds X thus obtained ##STR12## are then hydrolysed and converted by ring closure into compounds of tire formula I.

The present invention also provides a method E for preparing compounds of the formula I, wherein the compounds of the formula XI ##STR13## wherein R¹ to R⁶ have the meanings given above and X signifies O, S or NH, are reacted with a halide of the formulae XII, XIII or XIV, ##STR14## wherein Z is an atom of chlorine, bromine or iodine and R¹¹ and R¹⁶ have the meanings given above.

Finally it has been found that the new anellated (oxa)hydantoins of the general formula I possess outstanding herbicidal properties.

In the method A, in the case where R represents alkyl, the reaction is conducted in an inert organic solvent, for example, in an aromatic solvent such as toluene, chlorobenzene; a halogenated hydrocarbon such as chloroform or methylene chloride; an ether such as diisopropyl ether; or in acetonitrile or dimethylformamide, optionally base-catalysed at temperatures of between 20 and 120° C. Preferably organic bases are used, for example, organic amines such as triethylamine or pyridine (see EP-A1 0 272 594). Variants of the general method A are described in EP-A2 0 070 389.

In the method B, which has proved successful particularly in cases where R³ and R⁴ represent H, the reaction proceeds in water as solvent or, preferably, in the two-phase system water/organic solvent. Particularly preferred is the method of operation whereby compounds of the formulae IV and V, optionally salts of V, are added to an inorganic base, for example, an alkali metal hydroxide or alkaline earth metal hydroxide, carbonate or hydrogen carbonate such as sodium hydroxide or potassium carbonate, or to an organic base, for example, an organic amine such as triethylamine, and then maintained for several days, preferably 3 to 10 h, at a temperature of between -40 and +50° C., preferably between -10 and +10°C.

The compound of the formula III is formed in this aqueous solution in equilibrium. To it the isocyanate of the formula II, dissolved in an inert organic solvent, for example, toluene, chlorobenzene or chloroform, is added dropwise with vigorous stirring.

The pH-value of the aqueous phase is then established at between 1 and 3 by means of acid, preferably an inorganic acid such as aqueous hydrochloric acid or sulphuric acid. The urea derivatives of the formula VI thus arising are then formed into rings by known methods at a temperature of between 50 and 100° C. or, optionally, by conversion into an ester (R stands for alkyl or active ester) (see Houben-Weyl, Methoden der Organischen Chemie, volume XXV/1 and XXV/2 (1974))

The compounds of the formula II are known or can be prepared analogously by known methods; see Houben-Weyl, Methoden der Organischen Chemie, volume VIII, page 120 (1952); Houben-Weyl, volume IX, pages 875, 869 (1955) EP-B1 0 070 389; U.S. Pat. No. 4,881,967; EP-A1 322 401; U.S. Pat. No. 3,495,967; EP-A2 300 307; EP-A2 349 832.

Amines of the formula III are known and for R³ =R⁴ |=H can be prepared analogously to known methods see, for example, D. Seebach et al., Helv. Chim. Acta, volume 70, 1194 (1987).

Amines of the general formula IX are known or can be prepared according to EP-A 3 073 569 or in a manner analogous to the methods described there.

The present invention also relates to the use of the compounds of the formula I as herbicides as well as herbicidal compositions which contain an effective content of a compound of the formula I and a carrier. Carriers are preferably surface-active substances, solid or liquid diluents.

The invention also relates to a method for controlling noxious plants, wherein a herbicidally effective quantity of a compound according to formula I is applied to the noxious plants or to their environment (prior to or after germination).

CHEMICAL EXAMPLES ##STR15##

A mixture of 2,2-dimethyloxazolidine-4-carboxylic methyl ester (1.99 g, 0.01 mol), triethylamine (50.0 mg, 0.5 mmol) and toluene (30 ml) is prepared, to which 4-chlorophenyl isocyanate (1.40 g, 0.009 mol) dissolved in 20 ml of toluene is added dropwise. The reaction mixture is stirred at 20° C. for 15 h and then washed with 10% aqueous hydrochloric acid (3×10 ml) and water (3×10 ml), dried over sodium sulphate and filtered. After concentrating the filtrate by evaporation, the residue is dissolved in diethyl ether and reprecipitated from petroleum ether.

2.28 g (81% of the theoretical quantity) of 7-(4-chlorophenyl) -5,5-dimethyl-6,8-dioxo-4-oxa-1,7-diazabicyclo 3.3.0! octane having a melting point of 97-98° C. is obtained. ##STR16##

A mixture of serine (1.05 g, 0.01 mol) 37% aqueous formaldehyde solution (2 g) and aqueous sodium hydroxide solution (10 ml) is maintained at 4° C. for 12 h, cooled to 0 °C. then 4-chlorophenyl isocyanate (1.55 g) dissolved in chlorobenzene (5 ml) is added dropwise. The reaction mixture is then stirred at 0-5° C. for 1/2 h and at room temperature for approximately 2 h, the aqueous phase is extracted by shaking with chloroform (3×10 ml) and the collected organic phases are discarded.

The aqueous phase is then acidified to pH 1 with 5% aqueous hydrochloric acid and the product is introduced into the organic phase by shakina with ethyl acetate (3×10 ml), dried over sodium sulphate and filtered. After concentrating the filtrate by evaporation, the residue is taken up in acetonitrile (25 ml) and reacted with N-hydroxysuccinimide (1.15 g 0.01 mol). N,N'-dicyclohexyl carbodiimide (2.06 g, 0.01 mol), dissolved in acetonitrile (15 ml), is then added dropwise at 20° C. The reaction mixture is stirred for 12 h under reflux, then filtered and the filtrate is concentrated by evaporation. The remaining residue is taken up in a little acetone and again precipitated with water. 7-(4-chlorophenyl)-6,8-dioxo-4-oxa-7-diazabicyclo 3.3.0! octane having a melting point of between 74 to 76° C. is obtained in a quantity of 1.75 g (74% of the theoretical quantity).

The compounds of the general formula I shown in the following tables can be prepared analogously to Examples 1 and 2 and in accordance with the general description of methods A to E according to the present invention.

                                      TABLE 1     __________________________________________________________________________     1 #STR17##     2 #STR18##                                        Melting     R.sup.1       R.sup.2            R.sup.3                 R.sup.4                    R.sup.5                      R.sup.6                         R.sup.7        point ° C.     __________________________________________________________________________     H H    nC.sub.3 H.sub.7                 CH.sub.3                    H Cl H              88-94     H H    C.sub.2 H.sub.5                 C.sub.2 H.sub.5                    H Cl H              112-114     H H    C(CH.sub.3).sub.3                 H  H Cl H              112-114     H H    C.sub.6 H.sub.5                 CH.sub.3                    H Cl H              138-139     H H    --(CH.sub.2).sub.4                 -- H Cl H              127-128     H H    --(CH.sub.2).sub.5                 -- H Cl H                141-141.5     H H    --(CH.sub.2).sub.5                 -- H Br H     H H    --(CH.sub.2).sub.5                 -- Cl                      Cl H     H H    --(CH.sub.2).sub.6                 -- H Cl H              87-89     H H    --(CH.sub.2).sub.5                 -- F Cl H     H H    --(CH.sub.2).sub.5                 -- F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        glass-like     H H    CH.sub.3                 CH.sub.3                    F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        glass-like     H CH.sub.3            --(CH.sub.2).sub.5                 -- H Cl H              95-97     H H    H    H  Cl                      Cl H     H H    H    H  H Cl H              74-76     H H    H    H  Cl                      Cl Cl     H H    H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        89-91                                        (1 isomer)     H H    H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        Resin                                        (2 isomer)     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        glass-like                                        (1 isomer)     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        Resin                                        (2 isomer)     H CH.sub.3            H    H  H Cl H              96-98     H H    H    H  F Cl OCH.sub.3      172-175     H H    H    H  F Cl OCH(CH.sub.3).sub.2                                        glass-like     H CH.sub.3            H    H  F Cl OCH(CH.sub.3).sub.2                                        glass-like     H CH.sub.3            H    H  F Cl OCH.sub.2 C.tbd.CH                                        glass-like     H C.sub.6 H.sub.5            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        119-121     H CH.sub.3            H    H  F Cl OCH.sub.2 CO.sub.2 CH.sub.3                                        glass-like     H CH.sub.3            H    H  F Cl O(CH.sub.2).sub.2 OC.sub.2 H.sub.5                                        glass-like     H CH.sub.3            H    H  F Cl OCH(CH.sub.3)C.tbd.CH                                        glass-like     H CH.sub.3            H    H  F Cl OCH.sub.2 CH═CH.sub.2     H CH.sub.3            H    H  F Br OEt     H CH.sub.3            H    H  F Cl OCH.sub.2 CH.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl OCH(CH.sub.3)CO.sub.2 CH.sub.3     H CH.sub.3            H    H  Cl                      Cl OCH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F Cl OCH.sub.2 CO.sub.2 CH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F Cl OCH.sub.2 CO.sub.2 CH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F Cl OCH.sub.2 CO.sub.2 C.sub.5 H.sub.11     H CH.sub.3            H    H  F Cl CN     H CH.sub.3            H    H  F Cl OCH(CH.sub.3)C.tbd.CH     H CH.sub.3            H    H  F Cl OSi(CH.sub.3).sub.3     H CH.sub.3            H    H  F Cl SCH.sub.3     H CH.sub.3            H    H  F Cl SCH(CH.sub.3).sub.2     H CH.sub.3            H    H  F Cl SCH.sub.2 CH═CH.sub.2     H CH.sub.3            H    H  F Cl SCH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F Cl SCH.sub.2 CO.sub.2 C.sub.5 H.sub.11     H CH.sub.3            H    H  F Cl                         3 #STR19##     H CH.sub.3            H    H  F Cl OC(CH.sub.3)═N--OCH.sub.3     H CH.sub.3            H    H  F Cl OCH.sub.2 CH═N--OCH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2                                        Resin (3                                        isomer)     H CH.sub.3            H    H  F Cl OCH.sub.2 CH═N--OCH.sub.2 CH═CH.sub.2     H CH.sub.3            H    H  F Cl OCH.sub.2 CH═N--OCH.sub.2 CO.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl SCH.sub.2 CO.sub.2 H     H CH.sub.3            H    H  F Cl SCH.sub.2 CO.sub.2 CH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F Cl SCH.sub.2 CO.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl                         4 #STR20##     H CH.sub.3            H    H  F Cl OCHF.sub.2     H CH.sub.3            H    H  F Cl OCH.sub.2 C(Cl)═CH.sub.2     H CH.sub.3            H    H  F Cl OCF.sub.2 CHFCl     H CH.sub.3            H    H  F Cl OCH.sub.2 CH═CHCl     H CH.sub.3            H    H  F Cl OCF.sub.2 CHF.sub.2     H CH.sub.3            H    H  Cl                      Cl NHSO.sub.2 Me     H CH.sub.3            H    H  Cl                      Cl NHSO.sub.2 CH(CH.sub.3).sub.2     H CH.sub.3            H    H  H CH.sub.3                         OCH.sub.2 CH═CH.sub.2     H CH.sub.3            H    H  H CH.sub.3                         OCH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F CH.sub.3                         OCH.sub.2 C.tbd.CH     H CH.sub.3            H    H  F CH.sub.3                         OCH(CH.sub.3)C.tbd.CH     H CH.sub.3            H    H  F Cl NO.sub.2     H CH.sub.3            H    H  F CN OCH(CH.sub.3)C.tbd.CH     H CH.sub.3            H    H  H CN OCH.sub.2 C.tbd.CH     H CH.sub.3            H    H  Cl                      Cl NHSO.sub.2 NHCH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3)CF.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH.sub.2 CH.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3)CH.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3)C.tbd.CH     H CH.sub.3            H    H  F Cl CO.sub.2 N(CH.sub.3).sub.2     H CH.sub.3            H    H  F Cl                         5 #STR21##     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3)CH.sub.2 SCH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3)CO.sub.2 CH.sub.2 CH.sub.3     H CH.sub.3            H    H  F Cl CO.sub.2 CH.sub.2 CF.sub.3     H CH.sub.3            H    H  F Cl OCH.sub.2 C(O)CH.sub.3     H CH.sub.3            H    H  F Cl OCH.sub.2 P(O)(OC.sub.2 H.sub.5).sub.2     H CH.sub.3            H    H  F Cl OCH.sub.2 P(S)(CO.sub.2 H.sub.5).sub.2     H CH.sub.3            H    H  F Cl OCH.sub.2 C(O)N(CH.sub.3).sub.2     H CH.sub.3            H    H  F Cl                         6 #STR22##     H CH.sub.3            H    H  F Cl OCH.sub.2 C(O)NH.sub.2     H C.sub.6 H.sub.5            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2     H C.sub.6 H.sub.5            H    H  H Cl H     H C.sub.2 H.sub.5            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2     H C.sub.2 H.sub.5            H    H  F Cl OCH.sub.2 C.tbd.CH     H C.sub.2 H.sub.5            H    H  F Cl OCH(CH.sub.3)C.tbd.CH     H CH(CH.sub.3).sub.2            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2     H CF.sub.3            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2     H CF.sub.3            H    H  F Cl OCH.sub.2 C.tbd.CH     H CF.sub.3            H    H  F Cl OCH(CH.sub.3)C.tbd.CH     H C.sub.6 H.sub.4 F            H    H  F Cl CO.sub.2 CH(CH.sub.3).sub.2     H CH.sub.3            H    H  F CN CO.sub.2 CH(CH.sub.3).sub.2     H CH.sub.3            H    H  F Cl CH═CHCO.sub.2 CH.sub.2 CH.sub.3     __________________________________________________________________________

                                      TABLE 2     __________________________________________________________________________     1 #STR23##     7 #STR24##                                     Melting     R.sup.1       R.sup.2          R.sup.3                R.sup.4                   R.sup.5                     R.sup.6                         R.sup.8                            R.sup.9                                   W point ° C.     __________________________________________________________________________     H H  CH.sub.3                CH.sub.3                   F Cl  H  H      O     H H  CH.sub.3                CH.sub.3                   F Cl  H  CH.sub.3                                   O     H H  --(CH.sub.2).sub.5 --                -- F Cl  H  CH.sub.3                                   O     H H  H     H  F Cl  H  H      O     H H  H     H  F Cl  H  CH.sub.3                                   O     H H  H     H  F Cl  CH.sub.3                            CH.sub.3                                   O     H H  H     H  F Cl  CH.sub.3                            CH.sub.2 CH.sub.3                                   O     H H  H     H  F Cl  CH.sub.3                            CH.sub.2 F                                   O     H H  H     H  F Cl  H  CH.sub.3                                   S     H CF.sub.3          H     H  F Cl  H  CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  H  H      O     H CH.sub.3          H     H  Cl                     Cl  H  H      O     H CH.sub.3          H     H  H Cl  H  CH.sub.3                                   O     H CH.sub.3          H     H  Cl                     Cl  H  CH.sub.3                                   O     H CH.sub.3          H     H  Cl                     Cl  CH.sub.3                            CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  CH.sub.3                            CH.sub.3                                   O     H CH.sub.3          H     H  F Br  CH.sub.3                            CH.sub.3                                   O     H CH.sub.3          H     H  F CH.sub.3                         H  CH.sub.3                                   O     H CH.sub.3          H     H  F CH.sub.3                         CH.sub.3                            CH.sub.3                                   O     H CH.sub.3          H     H  F OCH.sub.3                         H  CH.sub.3                                   O     H CH.sub.3          H     H  F CN  H  CH.sub.3                                   O     H CH.sub.3          H     H  F CF.sub.3                         H  CH.sub.3                                   O     H CH.sub.3          H     H  H OCF.sub.2 H                         H  CH.sub.3                                   O     H CH.sub.3          H     H  F OCF.sub.2 H                         H  CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  CH.sub.3                            CH.sub.2 CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 CH.sub.3                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 Br                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 F                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 Cl                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 (CH.sub.2).sub.2 F                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 CH.sub.2 Cl                                   O     H CH.sub.3          H     H  F Cl  H  CH(CH.sub.3)F                                   O     H CH.sub.3          H     H  F Cl  H  CH(CH.sub.3).sub.2                                   O     H CH.sub.3          H     H  F Cl  H  CH.sub.2 (CH.sub.2).sub.3 Br                                   O     H CH.sub.3          H     H  F Br  H  CH.sub.2 CH.sub.3                                   O     H CH.sub.3          H     H  F Br  H  CH.sub.2 Br                                   O     H CH.sub.3          CH.sub.3                CH.sub.3                   F Cl  H  CH.sub.3                                   O     __________________________________________________________________________

                  TABLE 3     ______________________________________     1 #STR25##     8 #STR26##                                                     Melting     R.sup.1         R.sup.2                R.sup.3                       R.sup.4                            R.sup.5                                R.sup.6                                     R.sup.8                                          R.sup.9                                                 W   point ° C.     ______________________________________     H   H      H      H    H   H    H    Cl     S     H   H      H      H    F   Cl   H    H      S     H   H      H      H    F   Cl   H    Cl     S     H   H      H      H    F   Cl   CH.sub.3                                          CH.sub.3                                                 S     H   H      H      H    F   Cl   H    H      O     H   H      H      H    F   Cl   H    Cl     O     H   H      CH.sub.3                       CH.sub.3                            F   Cl   H    H      S     H   H      CH.sub.3                       CH.sub.3                            F   Cl   H    Cl     S     H   CH.sub.3                H      H    H   H    H    H      S     H   CH.sub.3                H      H    H   SCH.sub.3                                     H    H      S     H   CH.sub.3                H      H    H   H    H    Cl     S     H   CH.sub.3                H      H    H   H    Cl   Cl     S     H   CH.sub.3                H      H    H   H    H    CH.sub.2 CH.sub.3                                                 S     H   CH.sub.3                H      H    Cl  Cl   H    CH.sub.3                                                 S     H   CH.sub.3                H      H    F   Cl   H    CH.sub.3                                                 S     H   CH.sub.3                H      H    F   Cl   CH.sub.3                                          CH.sub.3                                                 S     H   CH.sub.3                H      H    Cl  Cl   H    CH.sub.3                                                 O     H   CH.sub.3                H      H    F   Cl   H    CH.sub.3                                                 O     H   CH.sub.3                H      H    F   Cl   CH.sub.3                                          CH.sub.3                                                 O     H   CH.sub.3                CH.sub.3                       CH.sub.3                            F   Cl   H    Cl     S     ______________________________________

                  TABLE 4     ______________________________________     1 #STR27##     9 #STR28##                                                  Melting                                                  point     R.sup.1         R.sup.2                R.sup.3   R.sup.4                               R.sup.5                                   R.sup.10   W   ° C.     ______________________________________     H   H      H         H    F   H          S     H   H      H         H    F   CH.sub.3   S     H   H      H         H    F   CH.sub.2 CH.sub.3                                              S     H   H      H         H    F   CH.sub.2 C.tbd.CH                                              S     H   H      H         H    F   CH(CH.sub.3)C.tbd.CH                                              S     H   H      H         H    F   CH.sub.2 CH═CH.sub.2                                              S     H   H      H         H    F   CH.sub.2 C.tbd.CH                                              O     H   CH.sub.3                H         H    Cl  H          S     H   CH.sub.3                H         H    F   H          S     H   CH.sub.3                H         H    F   CH.sub.3   S     H   CH.sub.3                H         H    F   CH.sub.2 CH.sub.3                                              S     H   CH.sub.3                H         H    F   CH.sub.2 C.tbd.CH                                              S     H   CH.sub.3                H         H    F   CH(CH.sub.3)C.tbd.CH                                              S     H   CH.sub.3                H         H    F   CH.sub.2 CH═CH.sub.2                                              S     H   CH.sub.3                H         H    F   CH.sub.2 OCH.sub.3                                              S     H   CH.sub.3                H         H    F   CH.sub.2 OCH.sub.2 CH.sub.3                                              S     H   CH.sub.3                H         H    F   CH.sub.2 CH.sub.2 CH.sub.3                                              S     H   CH.sub.3                H         H    F   CH(CH.sub.3).sub.2                                              S     H   CH.sub.3                H         H    F   CH.sub.2 CH═CHCH.sub.3                                              S     H   CH.sub.3                H         H    F   CH(CH.sub.3)CH.sub.2 CH.sub.3                                              S     H   CH.sub.3                H         H    F   CHF.sub.2  S     H   CH.sub.3                H         H    F   CF.sub.2 CHF.sub.2                                              S     H   CH.sub.3                H         H    F   CF.sub.2 CHFCl                                              S     H   CH.sub.3                H         H    F   CF.sub.2 CHFCF.sub.3                                              S     H   CH.sub.3                H         H    F   CH.sub.2 C.tbd.CH                                              O     H   CH.sub.3                H         H    F   CH(CH.sub.3)C.tbd.CH                                              O     H   CH.sub.3                H         H    F   CH(CH.sub.3).sub.2                                              O     H   CH.sub.3                H         H    F   CH.sub.2 C.tbd.CH                                              O     H   CH.sub.3                H         H    Cl  CH(CH.sub.3)C.tbd.CH                                              O     H   CH.sub.3                H         H    Cl  CH(CH.sub.3).sub.2                                              O     H   CH.sub.3                CH.sub.3  CH.sub.3                               Cl  CH.sub.2 C.tbd.CH                                              S     H   CF.sub.3                H         H    F   CH.sub.2 C.tbd.CH                                              S     H   H      CH.sub.3  CH.sub.3                               F   CH.sub.2 C.tbd.CH                                              S     H   H      --(CH.sub.2).sub.5 --                          --   F   CH.sub.2 C.tbd.CH                                              S     ______________________________________

                                      TABLE 5     __________________________________________________________________________     1 #STR29##     0 #STR30##                                    Melting     R.sup.1       R.sup.2          R.sup.3             R.sup.4                R.sup.5                  R.sup.8                      R.sup.9                         R.sup.10 W point ° C.     __________________________________________________________________________     H H  H  H  H H   H  CH.sub.3 O     H H  H  H  F H   H  CH.sub.3 O     H H  H  H  F H   H  CH.sub.2 C.tbd.CH                                  O 206-208     H H  H  H  F H   H  CH(CH.sub.3)C.tbd.CH                                  O     H H  H  H  F H   H  CH.sub.2 CH═CH.sub.2                                  O     H H  H  H  F CH.sub.3                      H  CH.sub.2 C.tbd.CH                                  O     H CH.sub.3          H  H  H H   H  CH.sub.3 O     H CH.sub.3          H  H  F H   H  CH.sub.3 O     H CH.sub.3          H  H  F H   H  C.sub.2 H.sub.5                                  O     H CH.sub.3          H  H  F H   H  CH.sub.2 CH.sub.2 CH.sub.3                                  O     H CH.sub.3          H  H  F H   H  CH.sub.2 CH.tbd.CH                                  O     H CH.sub.3          H  H  F H   H  CH.sub.2 CH.tbd.CH                                  O     H CH.sub.3          H  H  F H   H  CH(CH.sub.3)C.tbd.CH                                  O     H CH.sub.3          H  H  Cl                  H   H  CH.sub.2 C.tbd.CH                                  O     H CH.sub.3          H  H  Cl                  H   H  CH(CH.sub.3)C.tbd.CH                                  O     H CH.sub.3          H  H  F CH.sub.3                      H  CH.sub.2 C.tbd.CH                                  O     H CH.sub.3          H  H  F CH.sub.3                      H  CH(CH.sub.3)C.tbd.CH                                  O     H CH.sub.3          H  H  F CH.sub.3                      H  CH.sub.2 CH═CH.sub.2                                  O     H CH.sub.3          H  H  F CH.sub.3                      CH.sub.3                         CH.sub.2 CH.tbd.CH                                  O     H CH.sub.3          H  H  F H   H  CH.sub.2 CH.tbd.CH                                  S     H CH.sub.3          H  H  F CH.sub.3                      H  CH.sub.2 CH.tbd.CH                                  S     H CH.sub.3          H  H  F CH.sub.3                      CH.sub.3                         CH.sub.2 CH.tbd.CH                                  S     H CH.sub.3          CH.sub.3             CH.sub.3                F H   H  CH.sub.2 C.tbd.CH                                  O     H CF.sub.3          H  H  F H   H  CH.sub.2 C.tbd.CH                                  O     H CF.sub.3          H  H  F H   H  CH.sub.2 CH═CH.sub.2                                  O     H H  CH.sub.3             CH.sub.3                F H   H  CH.sub.2 C.tbd.CH                                  O     H H  H  H  F H   H  CH.sub.3 S     H H  H  H  F H   H  CH.sub.2 C.tbd.CH                                  S     H H  H  H  F H   H  CH.sub.2 CH═CH.sub.2                                  S     H CF.sub.3          H  H  F H   H  CH.sub.2 C.tbd.CH                                  S     H CH.sub.3          CH.sub.3             CH.sub.3                F H   H  CH.sub.2 C.tbd.CH                                  S     __________________________________________________________________________

                  TABLE 6     ______________________________________     1 #STR31##     1 #STR32##                                                Melting     R.sup.1         R.sup.2    R.sup.3                           R.sup.4                                  R.sup.5                                      R.sup.8                                            R.sup.9                                                point ° C.     ______________________________________     H   H          H      H      H   F     F     H   H          H      H      F   F     F     H   H          H      H      F   H     H     H   CH.sub.3   H      H      H   F     F     H   CH.sub.3   H      H      F   F     F     H   CH.sub.3   H      H      F   H     H     H   H          CH.sub.3                           CH.sub.3                                  F   F     F     H   CH.sub.3   CH.sub.3                           CH.sub.3                                  H   F     F     H   CH.sub.3   CH.sub.3                           CH.sub.3                                  F   F     F     H   CF.sub.3   H      H      H   F     F     H   CF.sub.3   H      H      F   F     F     H   CF.sub.3   CH.sub.3                           CH.sub.3                                  H   F     F     H   CF.sub.3   CH.sub.3                           CH.sub.3                                  F   F     F     H   CH.sub.2 CH.sub.3                    H      H      H   F     F     H   CH.sub.2 CH.sub.3                    H      H      F   F     F     ______________________________________

                  TABLE 7     ______________________________________     1 #STR33##     2 #STR34##                                                   Melting     R.sup.1         R.sup.2               R.sup.3 R.sup.4                           R.sup.5                                R.sup.6                                    R.sup.7   R.sup.8                                                   point ° C.     ______________________________________     H   H     CH.sub.3                       H   H    H   CO.sub.2 CH.sub.3                                              H     H   H     CH.sub.3                       H   H    H   CO.sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 C.sub.2 H.sub.5                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 C.sub.2 H.sub.5                                              H     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.2 CH.sub.3                                              H     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.3 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.3 CH.sub.3                                              H     H   H     CH.sub.3                       H   H    Cl  CO.sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   H    Cl  CO.sub.2 C.sub.2 H.sub.5                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   H    H   CO.sub.2 (CH.sub.2).sub.3 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   F    Cl  CO.sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   F    Cl  CO.sub.2 C.sub.2 H.sub.5                                              CH.sub.3     H   H     CH.sub.3                       H   F    Cl  CO.sub.2 (CH.sub.2).sub.2 CH.sub.3                                              CH.sub.3     H   H     CH.sub.3                       H   F    Cl  CO.sub.2 (CH.sub.2).sub.3 CH.sub.3                                              CH.sub.3     ______________________________________

Formulations

Suitable formulations containing compounds of the formula I can be prepared in the conventional manner, namely as powders, granules, pellets, solutions, suspensions, emulsions, wettable powders, emulsifiable concentrates, et cetera. A great many of these forms can be applied directly. Preparations capable of being sprayed may be diluted with suitable media and sprayed in quantities of between a few and several hundred liters per hectare. Highly concentrated preparations are used mainly as intermediate products for other formulations. The formulations contain, as a rough estimate, between 0.1 and 99% by weight of active substance(s) and at least one representative of the group a) of 0.1 to 20% of surface-active substances and b) of approximately 1 to 99.9% of solid or liquid diluents. More precisely, they contain these constituents in approximately the following quantities:

    ______________________________________               % by weight               Active            Surface-               substance                        Diluent  active substance     ______________________________________     Wettable powder                 20-90       0-74    1-10     Suspensions in oil,                  3-50      40-95    0-15     emulsions, solutions,     (including emulsifiable     concentrates)     Aqueous     10-50      40-84    1-20     suspensions     Dusts        1-25      70-99    0-5     Granules and                 0.1-95       5-99.9 0-15     pellets     Highly concentrated                 90-99       0-10    0-2     preparations     ______________________________________      *Active substance plus at least one surfaceactive substance or one diluen      = 100% by weight.

Lower or higher contents of active substances may of course be present, depending on the intended application and the physical properties. Higher quantitative proportions of surface-active substance:active substance are sometimes desirable and are achieved by incorporation in the formulation or by mixing in the container.

Typical solid diluents are described in Watkins et al., "Handbook of Insecticide Dust Diluents and Carriers", 2nd Ed., Dorland Books, Caldwell, N.J. However other solids, either obtained by mining or prepared industrially, may be used. The better absorbing diluents are preferred for wettable powders and the denser diluents are preferred for dusts. Typical liquid diluents and solvents are described in Marsden, "Solvents Guide", 2nd Ed., Interscience, New York, 1950. For concentrated suspensions less than 0.1% are preferred. Concentrated solutions are preferably stable against phase separation at 0° C. Lists of surface-active substances and their recommended applications are contained in "McCutcheon's Detergents and Emulsifiers Annual", MC Publishing Corp., Ridgewood, N.J., as well as in Sisely and Wood Encyclopedia of Surface Active Agents, Chemical Publishing Co. Inc., New York, 1964. All formulations may contain smaller quantities of additives to reduce foaming, agglomeration, corrosion, the growth of microorganisms, et cetera.

The methods for the preparation of these preparations are well-known. Solutions are prepared simply by mixing the components. Finely powdered solid preparations are obtained by mixing and, conventionally, by grinding, for example in a hammer mill or jet mill. Suspensions are obtained by wet grinding (see, for example, Littler, U.S. Pat. No. 3,060,084). Granules and pellets can be prepared by spraying the active substance on a preformed granule-shaped carrier or by agglomeration. In this connection see J. E. Browning, "Agglomeration", Chemical Engineering, Dec. 4, 1967, pages 147 ff. and "Perry's Chemical Engineer's Handbook", 5th Ed., McGraw-Hill, New York, 1973, pages 8-57 ff.

For further information regarding techniques of formulation reference may be made, for example, to the following:

H. M. Loux, U.S. Pat. No. 3,235,361, Feb. 15, 1966, column 6, line 16 to column 7, line 19 and examples 10 to 41;

R. W. Luckenbaugh, U.S. Pat. No. 3,309,192, Mar. 14, 1967, column 5, line 43 to column 7, line 62 and examples 8, 12, 15, 39, 41, 52, 53, 58, 132, 138-140, 162-164, 166, 167 and 169-182;

H. Gysin and E. Knusli, U.S. Pat. No. 2,891,855, Jun. 23, 1959, column 3, line 66 to column 5, line 17 and examples 1-4;

G. C. Klingman, "Weed Control as a Science", John Wiley and Sons Inc., New York, 1961, pages 81-96 and

J. D. Fryer and S. A. Evans, "Weed Control Handbook", 5th Ed., Blackwell Scientific Publications, Oxford, 1968, pages 101-103.

In the following examples parts are by weight, unless specified otherwise.

Example A

    ______________________________________     Wettable powder     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              80%     oxa-1,7-diazabicyclo 3.3.0!octane     Sodium alkylnaphthalensulphonate                              2%     Sodium lignosulphonate   2%     Synthetic amorphous silicic acid                              3%     Kaolinite                13%     ______________________________________

The constituents are mixed and ground in a hammer mill until all the solids have on the whole a particle size of less than 50 μm subsequently they are mixed again and packed.

Example B

    ______________________________________     Wettable powder     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              50%     oxa-1,7-diazabicyclo 3.3.0!octane     Sodium alkylnaphthalensulphonate                              2%     Methyl cellulose of low viscosity                              2%     Diatomaceous earth       46%     ______________________________________

The constituents are mixed, coarsely ground in a hammer mill and then ground in a jet mill until virtually all the particles have a diameter of less than 10 μm. The product is mixed again prior to packing.

Example C

    ______________________________________     Granular material     ______________________________________     Wettable powder from Example B                           5%     Attapulgite granules 95%     (USS 20-40 mesh; 0.84-0.42 mm)     ______________________________________

A suspension of wettable powder with 25% of solid substances is sprayed into a double-cone blender; the granules are then dried and packed.

Example D

    ______________________________________     Extruded pellets     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              25%     oxa-1,7-diazabicyclo 3.3.0!octane     Anhydrous sodium sulphate                              10%     Crude calcium lignosulphonate                               5%     Sodium alkylnaphthalensulphonate                               1%     Calcium/magnesium bentonite                              59%     ______________________________________

The constituents are mixed, ground in a hammer mill and then wetted with approximately 12% water. The mixture is extruded into cylinders having a diameter of approximately 3 mm, which are cut into pellets of approximately 3 mm in length. The latter can be used directly after drying; the dried pellets may however be comminuted so that they pass through the USS No. 20 sieve (apertures 0.84 mm diameter). The granules remaining behind on the sieve USS No. 40 (0.42 mm diameter aperture) may be packed for use, while the fine portions are recycled.

Example E

    ______________________________________     Granular material of low strength     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              1%     oxa-1,7-diazabicyclo 3.3.0!octane     N,N-dimethylformamide    9%     Attapulgite granules     90%     (USS sieve 20 to 40)     ______________________________________

The active substance is dissolved in the solvent and the solution is sprayed onto dust-free granules in a double-cone blender. After spraying the solution, the mixer is allowed to continue running for a short period, after which the granules are packed.

Example F

    ______________________________________     Granular material     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              80%     oxa-1,7-diazabicyclo 3.3.0!octane     Wetting agent            1%     Crude lignosulphonate (with 5 to 20%                              10%     of the natural sugar)     Attapulgite-clay         9%     ______________________________________

The constituents are mixed and ground until they pass through an 100 mesh sieve. This material is then delivered to a fluid bed granulator, where the air current is adjusted so that the material is easily whirled up, with a fine jet of water being sprayed onto the whirled material Fluidisation and spraying are continued until granules of the desired size are obtained. Spraying is then discontinued but fluidisation, optionally with the addition of heat, is continued until the water content has fallen to the desired value, generally less than 1%. The material is then removed and the desired particle size range, normally from 14 to 100 mesh (from 1410 to 149 μm) is screened out, after which it is packed for use.

Example G

    ______________________________________     Aqueous suspension     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                                40%     oxa-1,7-diazabicyclo 3.3.0!octane     Thickener based on polyacrylic acid                                 0.3%     Dodecylphenol polyethylene glycol ether                                 0.5%     Disodium phosphate          1%     Monosodium phosphate        0.5%     Polyvinyl alcohol           1.0%     Water                      56.7%     ______________________________________

The components are mixed and ground together in a sand mill in order to obtain particles having on the whole a size of less than 5 μm.

Example H

    ______________________________________     Strong concentrate     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                                99%     oxa-1,7-diazabicyclo 3.3.0!octane     Silicic acid aerogel        0.5%     Synthetic amorphous silicic acid                                 0.5%     ______________________________________

The constituents are mixed and ground in a hammer mill in order to obtain a material that passes through a USS-sieve No. 50 (0.3 mm aperture). The concentrate may, if required, contain other constituents.

Example I

    ______________________________________     Wettable powder     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              90.0%     oxa-1,7-diazabicyclo 3.3.0!octane     Dioctyl sodium sulphosuccinate                              0.1%     Synthetic fine silicic acid                              9.9%     ______________________________________

The constituents are mixed and ground in a hammer mill in order to obtain particles having on the whole a size of less than 100 μm. The material is screened through a USS No. 50 sieve and then packed.

Example J

    ______________________________________     Wettable powder     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              40%     oxa-1,7-diazabicyclo 3.3.0!octane     Sodium lignosulphonate   20%     Montmorillonite clay     40%     ______________________________________

The constituents are thoroughly mixed, coarsely ground in a hammer mill and then ground in an air jet mill in order to obtain particles having on the whole a size of less than 10 μm. The material is mixed again and then packed.

Example K

    ______________________________________     Suspension in oil     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              35%     oxa-1,7-diazabicyclo 3.3.0!octane     Mixture of polyalcohol carboxylic acid esters                               6%     and oil-soluble petroleum sulphonates     Xylene                   59%     ______________________________________

The components are mixed and ground together in a sand mill in order to obtain particles having on the whole a size of less than 5 μm. The product may be used directly, diluted with oil or emulsified in water.

Example L

    ______________________________________     Dust     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              10%     oxa-1,7-diazabicyclo 3.3.0!octane     Attapulgite              10%     Pyrophyllite             80%     ______________________________________

The active substance is mixed with attapulgite and then passed through a hammer mill in order to obtain particles on the whole of less than 200 μm. The ground concentrate is then mixed with powdered pyrophyllite until homogeneous.

Example M

    ______________________________________     Suspension in oil     ______________________________________     7-(4-chlorophenyl)-5,5-dimethyl-6,8-dioxo-4-                              25%     oxa-1,7-diazabicyclo 3.3.0!octane     Polyoxyethylene sorbitol hexaoleate                               5%     Highly aliphatic hydrocarbon oil                              70%     ______________________________________

The constituents are ground together in a sand mill until the particle size of the solids is less than approximately 5 μm. The resulting thick suspension may be used directly, but it is preferably used after dilution with oils or after emulsification in water.

BIOLOGICAL EXAMPLES

Experimental results show that the compounds according to the present invention are effective herbicides. They are suitable for the broad-spectrum control of weeds prior to and after the germination thereof on surfaces where the entire vegetation is to be kept under control, for example in the vicinity of industrial storage spaces, parking spaces, drive-in cinemas, around advertising hoardings, along country roads and along railways. Many of the compounds are also suitable for selective weed control in the cultivation of rice, wheat, barley, maize, soya beans, sugar beet and cotton.

The quantity to be applied of the compounds according to the present invention is dependent on numerous factors, including use as selective or as universal herbicides, the respective field crops, the nature of the weeds to be controlled weather and climate, the formulation selected, the method of application, the quantity of foliage plants et cetera. In general the compounds should be applied in quantities of between 0.001 and 20 kg/ha, with the lower quantities being suitable for lighter soils and/or soils with a low content of organic substances or for instances where only a short reaction period is required, for example in the case of herbicides for fallow land.

The compounds according to the present invention may be used in combination with any other commercially available herbicides.

The herbicidal properties of the compounds according to the present invention were detected in a series of greenhouse experiments. The test methods and results are given below. ##STR35## Test methods

Seeds of Digitaria spp., Echinochloa crus-galli, Setaria feberii, Avena fatua, Bromus secalinus, Abutilon theophrasti, Ipomoea spp., Xanthium pensylvanicum and sorghum-tubers were sown and prior to germination were treated with the test chemicals dissolved in a non-phytotoxic solvent.

In addition these weed species were treated with a preparation intended for soils and foliage. At the time of treatment the plants were between 2 and 18 cm in height. The treated plants and the control plants were maintained ii the greenhouse for 16 d, after which all samples were compared with the control plants and the effect of the treatment was assessed visually. The assessments summarised in Table A are on a numerical scale from 0=without damage to 10=complete annihilation.

The descriptive symbols shown have the following meanings:

C=chlorosis/necrosis

B=burning

H=effect on development

E=retardation of germination

G=promotion of growth

                                      TABLE A     __________________________________________________________________________     Application after germination (dosage 2 kg of active substance/ha)              Cpd.                 Cpd.                    Cpd.                       Cpd.                          Cpd.                             Cpd.                                Cpd.                                   Cpd.                                      Cpd.                                         Cpd.                                            Cpd.                                               Cpd.                                                  Cpd.                                                     Cpd.                                                        Cpd.                                                           Cpd.                                                              Cpd.                                                                 Cpd.              1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17 18     __________________________________________________________________________     Echinocloa c. -g.              2B 2B 1B 1B 1B 1B 2B 7B 2B 10B                                            2B 9B 10B                                                     9B 10B                                                           9  10 3     Bromus secalinus              1B 1B 0  0  0  0  1B 2B 1B 10B                                            1B 5B 9B 9B 10B                                                           -- -- --     Yanthium pens.              1B 1B 0  0  0  2B 0  1B 1B -- -- -- -- -- -- -- -- --     ipomoea spp.              4B 6B 0  7G,                          3G,                             5G 0  8B 6B 10B                                            8B 10B                                                  10B                                                     10B                                                        10B                                                           10 10 10                       2C 1B 2C     Sorghum  2B 2B 1B 1B 0  1B 1B 3B 2B 10B                                            3B 8B 9B 4B 10B                                                           10 10 8     Setaria feberii              1B 1B 0  1B 0  1B 1B 7B 1B 10B                                            3B 9B 10B                                                     10B                                                        10B                                                           10 10 6     Digitaria spp.              1B 1B 1B 1B 1B 1B 1B 7B 2B 10B                                            3B 9B,                                                  10B                                                     9B 10B                                                           10 10 7                                               6H     Abutilon th.              2B 1B 0  0  0  5B 1B 8B 7B 10B                                            4B 10B                                                  10B                                                     10B                                                        10B                                                           10 10 6     Avena fatua              2B 2B 0  1B 1B 1B 1B 3B 2B 10B                                            2B 6B 9B 9B 10B                                                           10 10 7     __________________________________________________________________________

                                      TABLE B     __________________________________________________________________________     Application prior to germination (dosage 2 kg of active substance/ha)              Cpd.                 Cpd.                    Cpd.                       Cpd.                          Cpd.                             Cpd.                                Cpd.                                   Cpd.                                      Cpd.                                         Cpd.                                            Cpd.                                               Cpd.                                                  Cpd.                                                     Cpd.                                                        Cpd.                                                           Cpd.                                                              Cpd.                                                                 Cpd.              1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16 17 18     __________________________________________________________________________     Echinocloa c. -g.              0  0  0  0  0  0  0  6H 0  9C 4C 9C 10C                                                     9C 10C                                                           -- -- --     Bromus secalinus              0  0  0  0  0  0  0  2G 1C 9C 3C 8C 9C 9C 10C                                                           -- -- --     Yanthium pens.              0  0  0  0  0  0  0  2G 0  -- -- -- -- -- -- -- -- --     ipomoea spp.              0  0  0  0  2G 0  0  0  1C 10C                                            4C 10C                                                  9C 10C                                                        10C                                                           10 10 9     Sorghum  0  0  0  0  0  0  0  0  1C 10C                                            2C 10C                                                  9C 8C 10C                                                           10 10 7     Setaria feberii              0  0  0  0  0  0  0  9H 0  10C                                            7C,                                               10C                                                  10C                                                     10C                                                        10C                                                           10 10 9                                            3H     Digitaria spp.              0  0  0  0  0  0  0  9H 1C 10C                                            6C 9C 9C 10C                                                        10C                                                           10 10 7     Abutilon th.              0  0  0  0  0  0  0  10C                                      1C 10C                                            10C                                               10C                                                  10C                                                     10C                                                        10C                                                           10 10 7     Avena fatua              0  0  0  0  0  0  0  0  1C 9C 1C 9C 9C 8C 10C                                                           10 10 3     __________________________________________________________________________

                  TABLE C     ______________________________________     Application after germination (dosage 0.2 kg/ha)               Cpd.    Cpd.    Cpd.  Cpd.  Cpd.  Cpd.     Object    10      12      13    15    16    17     ______________________________________     Maize     9B      2B      2B    6B    5B    5B     Wheat     4B      2B      3B    7B    5B    7B     Echinocloa c. -g.               9B      3B      9B    10B   8B    9B     Xanthium pens.               7B      --      --    --    6B    4B     Ipomoea spp.               10B     8B      9B    19B   8B    8B     Sorghum   4B      2B      3B    7B    7B    7B     Setaria feberii               7B      4B      6B    10B   8B    9B     Digitaria spp.               3B      2B      3B    9B    8B    7B     Abutilon th.               10B     9B      9B    10B   9B    10B     Avena fatua               3B      2B      3B    7B    5B    5B     ______________________________________

                  TABLE D     ______________________________________     Application prior to germination (dosage 0.2 kg/ha)               Cpd.    Cpd.    Cpd.  Cpd.  Cpd.  Cpd.     Object    10      12      13    15    16    17     ______________________________________     Maize     1C      0       0     2C    6H    6H     Wheat     0       0       2G    1G    2C    2C     Echinocloa c. -g.               1C      1C      6C    10C   9H    9H     Xanthium pens.               7B      --      --    --    2H    0     Ipomoea spp.               3C      1C      7C    10C   5H    10E     Sorghum   1C      0       2C    4C    8H    5G     Setaria feberii               9C      6C      7C    10C   10H   10H     Digitaria spp.               9G      3C      4C    10C   10H   10H     Abutilon th.               10C     10C     10C   10C   10C   10C     Avena fatua               2C      1C      0     4C    7H    7H     ______________________________________ 

We claim:
 1. An anellated (oxa)hydantoin of the formula I, ##STR36## wherein R¹ and R², independently of one another, represent hydrogen or a radical selected from the group consisting of (C₁ -C₄) alkyl, (C₁ -C₂) haloalkyl, phenyl, and fluorine-substituted phenyl,R³ and R⁴, independently of one another, represent hydrogen (C₁ -C₄) alkyl, phenyl, both optionally fluorine- and/or chlorine-, bromine- or methyl-substituted, or (C₁ -C₄) alkoxy; or also together form a carbocyclic ring which may optionally be (C₁ -C₄) alkyl-substituted, Q represents ##STR37## wherein W represents O, R⁵ represents hydrogen or halogen, R⁸ represents hydrogen, (C₁ -C₃) alkyl, (C₁ -C₃) haloalkyl, or halogen, R⁹ represents hydrogen, (C₁ -C₃) alkyl, (C₁ -C₃) haloalkyl or halogen, and R¹⁰ represents (C₁ -C₆) alkyl, (C₁ -C₆) haloalkyl, (C₂ -C₆) alkoxyalkyl, (C₃ -C₆) alkenyl or (C₃ -C₆) alkynyl.
 2. An anellated (oxa)hydantoin of the formula I according to claim 1, characterized in that at least one of the radicals satisfies the following:W represents O, R⁵ represents hydrogen or halogen, R⁸ represents hydrogen, (C₁ -C₃) alkyl or (C₁ -C₃) haloalkyl; R⁹ represents hydrogen, (C₁ -C₃) alkyl or (C₁ -C₃) haloalkyl; R¹⁰ represents (C₁ -C₄) alkyl, (C₁ -C₄) haloalkyl, (C₂ -C₄) alkoxyalkyl, (C₃ -C₆) alkenyl or (C₃ -C₆) alkynyl.
 3. Anellated (oxa)hydantoins of the formula I according to claim 1, characterized in that at least one of the radicalsR¹ and R², independently of one another, represent hydrogen or a radical of the series (C₁ -C₃) alkyl, (C₁ -C₂) haloalkyl or phenyl, which is optionally fluorine-substituted, R³ and R⁴ independently of one another, represent hydrogen, (C₁ -C₃) alkyl, or also together form a 5- to 6-membered carbocyclic ring, which may optionally substituted with (C₁ -C₄) alkyl radicals, W represents O or S, n represents 0, 1, or 2 R⁵ represents hydrogen, fluorine or chlorine, R⁶ represents chlorine, bromine or cyanogen, R⁷ represents hydrogen, OR¹¹ or CO₂ R¹¹) R⁸ and R⁹, independently of one another, represent hydrogen, (C₁ -C₂) alkyl or (C₁ -C₂) haloalkyl, R¹⁰ represents (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl, (C₃ -C₄) alkenyl or (C₃ -C₄) alkynyl, R¹¹ represents (C₁ -C₄) alkyl, (C₃ -C₆) cycloalkyl, (C₃ -C₆) alkenyl, (C₃ -C₆) alkynyl, (C₁ -C₄) haloalkyl, (C₂ -C₄) alkoxyalkyl, (C₂ -C₄) alkylthioalkyl, (C₂ -C₄) alkylsulphinylalkyl, (C₂ -C₄) alkylsulphonylalkyl, (C₃ -C₆) alkoxyalkoxyalkyl, (C₄ -C₈) cycloalkylalkyl, (C₂ -C₄) carboxyalkyl, (C₃ -C₆) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl, (C₆ -C₈) alkynyloxycarbonylalkyl, (C₆ -C₈) cycloalkoxyalkyl, (C₄ -C₆) alkenyloxyalky, (C₄ -C₆) alkynyloxyalkyl, (C₃ -C₆) haloalkoxyalkenyl (C₄ -C₈) haloalkenyloxyalkyl, (C₄ -C₆) haloalkynyloxyalkyl, (C₆ -C₈) cycloalkylthioalkyl, (C₄ -C₆) alkenylthioalkyl, (C₄ -C₆) alkynylthioalkyl, (C₁ -C₂) alkyl-substituted with phenoxy or benzyloxy, which are both optionally substituted with halogen-, (C₁ -C₃) alkyl- or (C₁ -C₃) haloalkyl; (C₄ -C₈) trialkylsilylalkyl, (C₃ -C₄) cyanoalkyl, (C₃ -C₆) halocycloalkyl, (C₃ -C₆) haloalkenyl, (C₅ -C₆) alkoxyalkenyl, (C₅ -C₆) haloalkoxyalkenyl, (C₅ -C₆) alkylthioalkenyl, (C₃ -C₆ ) haloalkynyl, (C₅ -C₆) alkoxyalkynyl, (C₅ -C₆) haloalkoxyalkynyl, (C₅ -C₆) alkylthioalkynyl, (C₂ -C₄) alkylcarbonyl, benzyl optionally substituted with halogen, (C₁ -C₂) alkyl or (C₁ -C₂) haloalkyl; CHR¹⁷ COR¹⁸, CHR¹⁷ P(O) (OR¹⁸)₂, P (O) (OR¹⁸)₂, CHR¹⁷ P(S) (OR¹⁸)₂, CHR¹⁷ C(O)NR¹² R¹³, CHR¹⁷ C(O)NH₂, phenyl or pyridyl, both optionally substituted with fluorine, chlorine or bromine, (C₁ -C₂) haloalkyl or (C₁ -C₂) alkoxy, R¹² represents hydrogen or (C₁ -C₂) alkyl, R¹³ represents (C₁ -C₂) alkyl, phenyl optionally substituted with fluorine, chlorine, bromine, (C₁ -C₂) alkyl, (C₁ -C₂) haloalkyl or (C₁ -C₂) alkoxy, or R¹² and R¹³ may be combined into rings as --(CH₂)₅ --, --(CH₂)₄ --, or --CH₂ CH₂ OCH₂ CH₂ --, wherein one or more H atoms in each ring may be substituted optionally by (C₁ -C₂) alkyl, R¹⁷ represents hydrogen or (C₁ -C₂) alkyl, R¹⁸ represents (C₁ -C₂) alkyl, (C₃ -C₄) alkenyl or (C₃ -C₄) alkynyl.
 4. Anellated (oxa)hydantoins of the formula I according to claim 1, characterized in that at least one of the radicalsR¹ and R², independently of one another, represent hydrogen, (C₁ -C₃) alkyl, (C₁ -C₂) haloalkyl or phenyl, R³ and R⁴, independently of one another, represent hydrogen, (C₁ -C₃) alkyl, or also together form a 5- to 6-membered carbocyclic ring R⁵ represents fluorine or chlorine, R⁶ represents chlorine, R⁷ represents OR¹¹ or CO₂ R¹¹, R¹¹ represents (C₁ -C₄) alkyl, (C₃ -C₆) cycloalkyl, (C₃ -C₆) alkenyl, (C₃ -C₄) alkynyl, (C₁ -C₃) haloalkyl, (C₂ -C₄)alkoxyalkyl, (C₃ -C₆) alkoxycarbonylalkyl, (C₆ -C₈) alkenyloxycarbonylalkyl or (C₆ -C₈) alkynyloxycarbonylalkyl.
 5. A herbicidal composition, characterized by having an effective content of a compound of the formula I according to claim 1 and a carrier for that.
 6. A method for controlling noxious plants, characterized in that a herbicidally effective quantity of the compound according to claim 1 is applied to the noxious plants or to their environment. 